> > Hadn't knew about mu metal. Thanks. :) Could be a nice thing for EM > > shielding, especially of things like transformers. > > Don't go jumping into the abyss without some knowledge.
Right. Later I found mu-metal is just a fancy name for Permalloy which I worked with some time ago. > (ObCredentials: I worked inside a double-walled Faraday cage in 1972-73 > doing Josephson junction experiments with superconducting > quantum-interferometric devices, aka SQUIDs. I did a lot of shaping and > bending of mu metal. I also later worked near Faraday cages and had > occasion to do more experiments in them.) The closest encounter I had with superconductors was when I was helping a friend with some measurements on some uranium-based ceramics. Was both brief and nice, and I lost fear of liquid nitrogen there. > > Besides, EU plans to embed RF tags into paper money. > > Various lengths of metallic conductors are already inside various > banknotes. This is NOT the same technology as RFID. I don't disagree > about it being a concern, and an area for study and experiment, but be > careful not to leap to conclusions about banknotes being a location > finder. I am VERY aware about the current metal strip. I am not worried about them at all. I am worried about the embedding of REAL RFID tags. The metal strip then could serve dual purpose, as an anticounterfeit device itself, and as the tag antenna. The banknotes could then carry their own history. The only consolation is that it will get cracked within few months at most. See here: http://educate-yourself.org/cn/BraveNewEuro7jan02.shtml http://www.eetimes.com/story/OEG20011219S0016 > Jamming is grossly less efficient than detection. If you want an > explanation, let me know and I'll spend 10 minutes writing a small > piece on it. But first, think deeply about why this is so. Think > especially about recovering signals from noise. Had my brush, though only theoretical, with integrating repeating signals back at school, when I was learning how to interpret NMR spectrums and how they work. (Good old times, it feels like yesterday.) Sorry, hadn't specified I am not talking about RFID tags anymore; was thinking about at least partially alleviating/sidestepping the problems with shielding of standard desktop computers. But will be definitely interested in the minilecture.
